How do the sand dollar’s physical qualities improve its life span? By looking unappetizing to predators, the sand dollar can prevent being eaten.
By developing a hairy coat on its shell, the sand dollar can tolerate cold waters.
By keeping a thin skeleton, the sand dollar can camouflage itself in the sand.
By maintaining a delicate frame, the sand dollar can avoid being picked up by collectors.

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By keeping a thin skeleton, the sand dollar can camouflage itself in the sand.

Explanation:

Sand dollar are very small and peculiar sea urchins. They have very few predators like some fish and starfish, but they manage to get rid of predation with their own bodies, which is very useful for such a small creature. This is because sand dollars have small spines on their bodies, which in addition to allowing them to move forward on the ocean floor with great speed, allows them to hide in the sand, preventing their predators from finding them.

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explanation:

the answer to your question is the introduction, because the main text is the body paragraphs, and the table of contents is used to locate paragraphs, and the conclusion is where you wrap up all your thoughts in the end.